#include <queue>
#include <vector>
#include <pthread.h>
#include <functional>
#include <iostream>
#include "Log.hpp"
#include "Thread.hpp"
#include "LockGuard.hpp"

static const int defaultnum = 5;

class ThreadData
{
public:
    ThreadData(const std::string& threadname)
    :_threadname(threadname)
    {}

    ~ThreadData()
    {}
public:
    std::string _threadname;
};

template <class T>
class ThreadPool
{
private:
    ThreadPool(int thread_num = defaultnum)
    :_threadnum(thread_num)
    {
        pthread_mutex_init(&_mutex, nullptr);
        pthread_cond_init(&_cond, nullptr);

        for(int i = 0;i < _threadnum;i ++)
        {
            std::string threadname = "thread-";
            threadname += std::to_string(i + 1);

            ThreadData td(threadname);

            auto threadFunc = std::bind(&ThreadPool<T>::ThreadRun, this, std::placeholders::_1);
            _threads.emplace_back(threadname, threadFunc, td); // 确保这里的参数类型匹配


            lg.LogMessage(Info, "%s is created...\n", threadname.c_str());
        }
    }
    ThreadPool(const ThreadPool<T> &tp) = delete;
    const ThreadPool<T> &operator=(const ThreadPool<T>) = delete;

public:

    static ThreadPool<T> *GetInstance()
    {
        if(instance == nullptr)
        {
            LockGuard lockguard(&sig_lock);
            if(instance == nullptr)
            {
                lg.LogMessage(Info, "创建单例成功...\n");
                instance = new ThreadPool<T>();
            }
        }

        return instance;
    }
    
    bool Start()
    {
        for(auto &thread: _threads)
        {
            thread.Start();
            lg.LogMessage(Info, "%s is running ...\n", thread.ThreadName().c_str());
        }

        return true;
    }

    void ThreadWait(const ThreadData &td){
        lg.LogMessage(Debug, "No task, %s is sleeping");
        pthread_cond_wait(&_cond, &_mutex);
    }

    void ThreadWakeup()
    {
        pthread_cond_signal(&_cond);
    }

    void checkself(){};

    void ThreadRun(const ThreadData &td)
    {
        while(true)
        {
            // checkSelf();

            T t;
            {
                LockGuard lockguard(&_mutex);
                while(_q.empty())
                {
                    ThreadWait(td);
                    lg.LogMessage(Debug, "thread %s is wakeup\n", td._threadname.c_str());
                }

                t = _q.front();
                _q.pop();
            }

            t();
            // lg.LogMessage(Debug, "%s handler task %s done, result is: %s\n",
            //                 td._threadname, t.PrintResult().c_str());
        }
    }

    void Push(T& in)
    {
        // lg.LogMessage(Debug, "other thread push a task, task is : %s\n", in.PrintTask().c_str());
        LockGuard lockguard(&_mutex);
        _q.push(in);
        ThreadWakeup();
    }

    void Wait()
    {
        for(auto &thread : _threads)
        {
            thread.Join();
        }
    }
    ~ThreadPool()
    {
        pthread_mutex_destroy(&_mutex);
        pthread_cond_destroy(&_cond);
    }
private:
    std::queue<T> _q;
    std::vector<Thread<ThreadData>> _threads;
    int _threadnum;
    pthread_mutex_t _mutex;
    pthread_cond_t _cond;

    static ThreadPool<T> *instance;
    static pthread_mutex_t sig_lock;
};

template<class T>
ThreadPool<T> *ThreadPool<T>::instance = nullptr;
template<class T>
pthread_mutex_t ThreadPool<T>::sig_lock = PTHREAD_MUTEX_INITIALIZER;